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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 429,246 |  | $ 429,246 |  | $ 411,110
Equity in income (loss) of real estate venture | (4,981) | $ (7,240) | (9,544) | $ (14,164) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 341,748 |  | 341,748 |  | 317,959
Equity in income (loss) of real estate venture | (2,574) | (4,661) |  |  |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 85,614 |  | 85,614 |  | 85,867
Equity in income (loss) of real estate venture | (381) | (778) |  |  |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 31,478 |  | 31,478 |  | 31,680
Equity in income (loss) of real estate venture | (101) | 117 |  |  |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | (29,594) |  | $ (29,594) |  | $ (24,396)
Equity in income (loss) of real estate venture | $ (1,925) | $ (1,918) |  |  |

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